Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Optimal Combining and Partial C
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Research Article Signal Processing by Generalized Receiver in DS-CDMA Wireless Communication Systems with Optimal Combining and Partial Cancellation Vyacheslav Tuzlukov School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Room 407A, Building IT3, 1370 Sankyuk-dong, Buk-gu, Daegu 702-701, Republic of Korea Correspondence should be addressed to Vyacheslav Tuzlukov, [email protected] Received 2 June 2010; Revised 25 November 2010; Accepted 5 February 2011 Academic Editor: Kostas Berberidis Copyright © 2011 Vyacheslav Tuzlukov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Symbol error rate (SER) of quadrature subbranch hybrid selection/maximal-ratio combining (HS/MRC) scheme for 1-D modulations in Rayleigh fading under employment of the generalized receiver (GR), which is constructed based on the generalized approach to signal processing (GASP) in noise, is investigated. N diversity input branches are split into 2N inphase and quadrature subbranches. M-ary pulse amplitude modulation, including coherent binary phase-shift keying (BPSK), with quadrature subbranch HS/MRC is investigated. GR SER performance for quadrature HS/MRC and HS/MRC schemes is investigated and compared with the conventional HS/MRC receiver. Comparison shows that the GR with quadrature subbranch HS/MRC and HS/MRC schemes outperforms the traditional HS/MRC receiver. Procedure of partial cancellation factor (PCF) selection for the first stage of hard-decision partial parallel interference cancellation (PPIC) using GR employed by direct-sequence code-division multiple access (DS-CDMA) systems under multipath fading channel in the case of periodic code scenario is proposed. Optimal PCF range is derived based on Price’s theorem. Simulation confirms that the bit error rate (BER) performance is very close to potentially achieved one and surpasses the BER performance of real PCF for DS-CDMA systems discussed in the literature.
1. Introduction In this paper, we investigate the generalized receiver (GR), which is constructed based on the generalized approach to signal processing (GASP) in noise [1–5], under quadrature subbranch hybrid selection/maximal-ratio combining (HS/MRC) for 1-D modulations in multipath fading channel and compare its symbol error rate (SER) performance with that of the traditional HS/MRC scheme discussed in [6, 7]. It is well known that the HS/MRC receiver selects the L strongest signals from N available diversity branches and coherently combines them. In a traditional HS/MRC scheme, the strongest L signals are selected according to signalenvelope amplitude [6–12]. However, some receiver implementations recover directly the in-phase and quadrature components of the received branch signals. Furthermore,
the optimal maximum likelihood estimation (MLE) of the phase of a diversity branch signal is implemented by first estimating
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